Condenser terminal



Jan. 22, 1929. 1,699,745

R. E. MARBURY CONDENSER TERMINAL Filed Aug. 18, 1923 INVENTOR BY 7 W ATTORNEY Patented .1... 22, 1929.

UNITED STATES PATENT;

OFFICE. L

RALIH E. MABBUBY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

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Application fl led August 18, 1923. Serial No. 658,012.

My invention relates to condensers, more" particularly to condensers which are imp iegnated' with, or immersed in, insulating 01 s. In a condenser of this type, it was found practically impossible to provide ordinary terminals leading into the condenser WllCll were insulated from the casing thereof and yet were oil-tight. In my copending application, Serial No. 449,650,. for condenser terminals, filed March 5, 1921, I have disclosed an oil-tight terminal which is superior, in many respects to those previously used in the art, but which is relatlvely complicated. Some of the previous structures have had the complication of a screw base, or a plain base which is welded to the apparatus, of which it is apart. Others have used a bushing with a sleeve between 'the terminal rod andbushing, or a metal shoulder which is crimped into the insulating bushing when the terminal is assembled to produce an oil tight joint. Such structures however, involve arelatively high cost of manufacture. v

.Various condenser housings, such as the interlocking tongue and slot type, or those having welded or soldered seams have been designed heretofore. Such structures have some disadvantages, such as complicated assembly, commercial" impracticability or high cost manufacture.

The present invention is designed to 0v rcome these difficulties, it being among he objects thereof to rovide a condenser terminal which shall e comparatively simple in construction, which shall be capable of forming an oil-tight joint, and well insulated from adjacent parts.

It is a further-object of this invention to provide an oil-tight condenser, housing or container which may be easily assembled.

My present invention, therefore, contemplates providingan easily constructed oiltight condenser housing. and'oil-tight condenser terminals fitting into, and well 1n sulated from, said housing.

In the accompanying drawin constituting a part hereof, and" in which ikereferenoe characters designate like parts,

Figure 1 is a plan .view of a condenser iacket 10 of suitable material, such ain, which surrounds the upper constructed in accordance with my invention, some parts being shown in section;

Fig. 2 is a view, partially in' side elevation and partially in section of the condenser, with the terminals in place; and

Fig. 3 is a fragmentary sectional view of apart of a condenser terminal constructed 1n accordance with my invention,

The housing or casing 1 is lined with layers of insulating material 2, and contains a condenser body 3 of any suitable kind. Conductor leads 4 are secured t'othe condenser b y In the casing 1' are terminal openings 6, the walls of which are formed with a frustoconically flared flange or struck-up tapered portion,'whi'ch is made by flaring or pressing up a suitable portion of the material immediately surrounding said opening. The desired taper may beimparted thereto as the flange is formed. A tapered insulating bushing 7, having a similarly tapered opening, fits into opening 6. A correspondingly tapered metal terminal rod 8 is inserted in the opening or bushing 7 as shown in Fi 3. The conductors 4 are secured to the ro s 8 as shown in Fig. 2. y

A washer 9 of felt or otherresilient oilresisting material surrounds. each flanged opening 6, and supports an insulating as porcepartof insulating bushing 7 and through which the terminal rod 8 passes, a suitable clearance bein allowed between the jacket and the bushlng 7 and rod- 8. Into the recess formed by such clearance there is poured a suitable insulating cement 11 which hardens in a short time.

Y A felt washer 12 and a metal washer 13 are placed over the rod 8, the upper end of which has a threaded portion 16 for the reception of nuts 14 and 15. The nut 14.- is

threaded on the rod 8 causing the various 5 tapered members .to be brought into intimate engagement. The insulating cement 11 insures a permanent oil-tight terminal.

A. suitable sealed plug is placedin the 3 top of the container for filling the same with oil.

The structure comprises an internally and externally threaded bushing 17 which flts into an opening inthe container 1, and held inplace by a-nut 18. A plug 19 is threaded into bushing 17 and a machine screw 20, to which a ground connection may be fastened, is thi'eaded thereon. A suitable seal 21 prevents unauthorized removal of the plug. j

It will be seen that new condenser "terminal constructionprovides an electrode terminal which is completely insulated from the body of the casing and that the joint so formed is entirely oil tight. It requires but a small amount of'pressure to force the tapered engaging surfaces into close contact with each other and there is practicallyno danger of the various parts, becoming rupg tured, since the strains thereon are far be low the ultimate strength ofthe materials .used. The insulating cement insures that any crevices which might otherwise allow a small leakage arewell sealed.

It is apparent that various changes in construction of the parts may be made within the scope of my invention. For instance, the insulating body 7 may be molded integrally with the rod 8 or, in the construction of the container, in place of." thesolder 29,

; normal to the plane of the sheet and a flange portion pressedout of the plane of tion of the bushing, and sealing means havthe sheet around said opening toward the smaller end ofv the bushing and laterally intimately engaging said frusto-conical poring a portion surrounding the bushing ad- I l jaceiit to said flange.

2. terminal comprising an insulating bushing having a substantially frusto-conij cal outer longitudinal-surface portion, a conductor extending through the bushing in fluid-tight relation thereto, a base member,- of sheet material having an opening in which the bushing is disposed substantially normal to the plane of the sheet and a flange portion pressed out of the plane of the sheet around saidopening toward the smaller end of the bushing and laterally intimately engaging said frusto-conical portion of the bushing, and an insulating jacket surrounding the bushing and said flange in sealed relation thereto.

3. A terminal comprising an insulating bushing having a substantially frusto-coni cal outer longitudinal-surface portion, 'a conductor extending throughthe bushing in fluid-tight relation thereto, a base member of sheet material having an opening in which the bushing is disposed substantially, normal to the plane-of the sheet and'a flange portion pressed out of the plane of the sheet around said opening toward the smaller end of the bushing and laterally intimatelyengaging said frusto-conical portion of the bushing, an insulating jacket having a portion of inverted substantially cup-shape through the transverse wall of which said conductor extends, said jacket being disposed over and around the smaller'end of said bushing in sealed relation thereto and to said conductor and'annular sealing means surrounding the bushing between said sheet and said jacket.

4;. A terminal, comprising an insulating bushing having substantially frusto-eonical inner and outer longitudinal surface portions, a conductor extending through the bushing and having and outer surface substantially conforming to said inner surface and disposed in fluid-tight engagement therewith, a base member of sheet material having an'opening in which the insulating member is disposed substantially normal to the plane of the sheet and a substantially frusto-conical flange portion pressed out of the plane of the sheet around said opening toward the smaller end of the bushing and laterally intimately engaging said outer 1 RALPH- E. MARBURY. 

